BigPack BMW F8X M3 M4, Intercooler + Radiators Skin 81psi pressure drop: 540CFM (368CFM) Performance 81psi pressure drop: 540CFM (368CFM) Bend: 60 degree Inner diameter 1 (mm): 60 mm Inner diameter 2 (mm): 63 mm Inner diameter 1 (inch): 2 3 8 inch Inner diameter 2 (inch): 2 1 2 inch Leg length (see picture): 125 mm Color: Blue Wall thickness: 5 mm Temperature range: 40 to +180 degreeC Outer diameter 1: 70 mm Outer diameter 2: 73 mm Reinforcement: 4 layers Material: High quality silicone rubber polyester fabric The stock top mounted intercooler has a Tube&Fin core with clamped plastic end tanks These pipes are a week link on any tuned car or in some cases even on a stock tune